@ orchid grower - please don't be looking to add, add, add to improve your orchid-growing. Magnesium and calcium are essential to plant growth, but might be sufficient in your water supply or current fertilizer, so be certain about that first.
Orchids, for the most part, have definite, but meager demand for nutrients. "More" is not always "better", and can actually be detrimental.
As to the use of Epsom Salts to flush residues out of growing media, I think someone has taken a little piece of knowledge (not understanding) and is spreading it into an unrelated area:
When preparing new LECA for use, an extended soak in an Epsom Salts solution can help extract manufacturing residues, which are sodium salts. The magnesium ions precipitate as the sodium ions go into solution - along the same lines as a water softener, but we're dumping the water in this case. When trying to remove mineral buildup from used pots, it can also help, but less so, as the minerals tend to be calcium and magnesium carbonates.
In the very brief, transient nature of pouring a solution through orchid potting media, none of that is going to happen, plus, the precipitated minerals in potting media are far less reactive.
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